postmeta table corruption?

Hi,

I just realized my postmetatable is at colse to 2 million rows, and for every post_id I have dozens (sometimes hundreds) of rows with meta_key _utw_tags_0 and meta_value a:0:{}.

I’m not really sure what that means, but I’m pretty sure I should worry and do something about it. Any ideas?

Thanks,

César
http://obm.corcoles.net